Author Topic: Artemis 1 Launch Calendar (from FOIA request)  (Read 5488 times)

Offline NASA Pilot

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Artemis 1 Launch Calendar (from FOIA request)
« on: 09/24/2021 12:11 am »
Hello,

Recently I FOIA'ed the Artemis 1 Launch Calendar and wanted to share it with y'all.

The calendar shows the launch windows, mission durations, and how often SLS can attempt to launch in 1 week. Red days are where Orion can be sent to the moon (SLS has enough performance) however a constraint for Orion's mission is violated.

This gives no firm indication of when A1 might launch, but we will now have a better idea of what the launch windows are like.

Offline Jim

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Re: Artemis 1 Launch Calendar (from FOIA request)
« Reply #1 on: 09/24/2021 02:38 am »
Hello,

Recently I FOIA'ed the Artemis 1 Launch Calendar and wanted to share it with y'all.

The calendar shows the launch windows, mission durations, and how often SLS can attempt to launch in 1 week. Red days are where Orion can be sent to the moon (SLS has enough performance) however a constraint for Orion's mission is violated.

This gives no firm indication of when A1 might launch, but we will now have a better idea of what the launch windows are like.

Launch periods are the days a mission can launch
Launch window is the times a mission launch during a day

Offline AstroWare

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Re: Artemis 1 Launch Calendar (from FOIA request)
« Reply #2 on: 09/24/2021 02:57 am »
What are the differences in short class and long class trajectories?

(Obviously length of mission - I'm wondering if it spends more orbits  around earth, longer transit in deep space, etc. This is the first I've seen of two types of Artemis 1 profiles)

Offline AstroWare

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Re: Artemis 1 Launch Calendar (from FOIA request)
« Reply #3 on: 09/24/2021 03:07 am »
What are the differences in short class and long class trajectories?

(Obviously length of mission - I'm wondering if it spends more orbits  around earth, longer transit in deep space, etc. This is the first I've seen of two types of Artemis 1 profiles)
Probably poor form to reply to myself, but could it be bullet point (11) from this NASA graphic, which says Orion will do "half or one and a half" distant retrograde orbits? I never noticed that before.
 https://www.nasa.gov/image-feature/artemis-i-map

Offline NASA Pilot

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Re: Artemis 1 Launch Calendar (from FOIA request)
« Reply #4 on: 09/24/2021 10:01 am »
Ah my bad sorry about that. Got confused with launch windows and launch periods.
« Last Edit: 09/24/2021 10:01 am by NASA Pilot »

Offline Spaceguy5

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Re: Artemis 1 Launch Calendar (from FOIA request)
« Reply #5 on: 09/24/2021 06:51 pm »
What are the differences in short class and long class trajectories?

(Obviously length of mission - I'm wondering if it spends more orbits  around earth, longer transit in deep space, etc. This is the first I've seen of two types of Artemis 1 profiles)

The long class missions have a longer duration so that they can meet lighting requirements for when Orion splashes down. This is a good paper for describing how the Artemis I trajectory was developed and analyzed:

Trajectory Design Considerations for Exploration Mission 1

Offline Overwatchfan123

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Re: Artemis 1 Launch Calendar (from FOIA request)
« Reply #6 on: 09/27/2021 05:49 pm »
This is great! By the way, what do SLS Perf Avail, Orion Constraint Violation, Available Short Class, and Available Long Class all mean?
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Offline NASA Pilot

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Re: Artemis 1 Launch Calendar (from FOIA request)
« Reply #7 on: 09/29/2021 09:16 pm »
This is great! By the way, what do SLS Perf Avail, Orion Constraint Violation, Available Short Class, and Available Long Class all mean?

SLS Perf Avail-Orion Constraint Violation means SLS can send Orion to the moon, but a constraint for Orion's mission is violated so it cant do its mission.

Short Class and Long Class are the length of Orion's mission. Orion has to spend more or less time in space in order to meet lighting requirements for splashdown. See SpaceGuy's post above for a paper on that.
« Last Edit: 09/29/2021 09:17 pm by NASA Pilot »

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